2018 Volume 72 Issue 1 Pages 99-105
The purpose of this study is to investigate the effect of polymer content on flexural and compressive strengths of polymer-modified mortars. Polymer-modified mortars using re-dispersible polymer powder and with fine aggregate cement ratio of 2 and 3, water-cement ratios of 45, 50, 55 and 60％, polymer contents of 0, 2, 4 and 6％ are prepared, and cured under 2d-wet＋5d-water＋21d-dry or 2d-wet＋26d-dry condition. Cured specimens are tested for flexural and compressive strengths. As a result, flexural and compressive strength effective factors consist of water cement ratio, polymer content, air content and fine aggregate cement ratio are proposed. Regardless of the type of polymer and curing condition, the good relationships are recognized for the flexural and compressive strengths of the polymer-modified mortars and the products of the strength effective factors by those strengths of unmodified mortar. The polymer content may be used as a new mix proportioning factor of the polymer-modified mortars.
